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Acadia National Park Managers’ Report
A citizen science early-detection summary
Welcome to the weekly early detection report of observations submitted by iNaturalist and eBird users. These are all observations submitted over the past week for species that Acadia National Park managers and partners have identified as being of conservation interest. These data for this report comes from two of the largest open source citizen science projects: iNaturalist and eBird. The records included in this report include both casual and research grade observations, so erroneous identifications are possible. Users should double check the identification of species to ensure they are correct.
31 July 2025 - 06 August 2025

Explore Species Locations

Invasive Species

A Hemlock tree infested with Hemlock Woolly Adelgid
© Jesse Wheeler
Scientific Name Common Name Date Observed Link
Frangula alnus alder buckthorn 2025-08-01 view observation
Galeopsis bifida bifid hemp-nettle 2025-08-01 view observation
Lotus corniculatus bird’s-foot trefoil 2025-07-30 view observation
Lotus corniculatus bird’s-foot trefoil 2025-08-03 view observation
Solanum dulcamara bittersweet nightshade 2025-07-28 view observation
Solanum dulcamara bittersweet nightshade 2025-07-29 view observation
Solanum dulcamara bittersweet nightshade 2025-07-30 view observation
Solanum dulcamara bittersweet nightshade 2025-07-30 view observation
Solanum dulcamara bittersweet nightshade 2025-07-30 view observation
Epipactis helleborine broad-leaved helleborine 2025-07-30 view observation
Epipactis helleborine broad-leaved helleborine 2025-08-01 view observation
Cirsium vulgare bull thistle 2025-08-01 view observation
Calluna vulgaris common heather 2025-08-02 view observation
Lupinus polyphyllus large-leaved lupine 2025-08-03 view observation
Hylotelephium telephium orpine 2025-07-29 view observation
Securigera varia purple crownvetch 2025-07-28 view observation
Securigera varia purple crownvetch 2025-07-28 view observation
Securigera varia purple crownvetch 2025-07-28 view observation
Securigera varia purple crownvetch 2025-07-30 view observation
Securigera varia purple crownvetch 2025-08-03 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-28 view observation
Rosa rugosa rugosa rose 2025-07-30 view observation
Rosa rugosa rugosa rose 2025-07-31 view observation
Rosa rugosa rugosa rose 2025-07-31 view observation
Rosa rugosa rugosa rose 2025-08-01 view observation
Rosa rugosa rugosa rose 2025-08-03 view observation
Rosa rugosa rugosa rose 2025-08-03 view observation
Potentilla recta sulphur cinquefoil 2025-07-28 view observation

Threatened & Endangered Species

Two Red Knots in flight
© Fyn Kynd
Scientific Name Common Name Listing Date Observed Link
Sterna paradisaea arctic tern state threatened 2025-07-28 view observation
Sterna paradisaea arctic tern state threatened 2025-07-29 view observation
Sterna paradisaea arctic tern state threatened 2025-08-02 view observation
Sterna paradisaea arctic tern state threatened 2025-08-02 view observation
Histrionicus histrionicus harlequin duck state threatened 2025-07-31 view observation
Falco peregrinus peregrine falcon state endangered 2025-07-28 view observation
Falco peregrinus peregrine falcon state endangered 2025-07-28 view observation
Falco peregrinus peregrine falcon state endangered 2025-07-31 view observation
Falco peregrinus peregrine falcon state endangered 2025-08-01 view observation
Falco peregrinus peregrine falcon state endangered 2025-08-01 view observation
Alca torda razorbill state threatened 2025-07-28 view observation

Rare Species

A flowering Nodding Trillium
© Andy Fyon
Scientific Name Common Name Date Observed Link
Ursus americanus american black bear 2025-08-01 view observation
Teucrium canadense american germander 2025-07-29 view observation
Teucrium canadense american germander 2025-08-01 view observation
Teucrium canadense american germander 2025-08-01 view observation
Asclepias syriaca common milkweed 2025-08-03 view observation
Toxicodendron radicans eastern poison ivy 2025-07-30 view observation
Symplocarpus foetidus eastern skunk cabbage 2025-08-01 view observation
Euthamia graminifolia flat-topped goldenrod 2025-07-31 view observation
Euthamia graminifolia flat-topped goldenrod 2025-08-03 view observation
Polygonatum pubescens hairy solomon’s-seal 2025-07-30 view observation
Danaus plexippus monarch 2025-07-31 view observation
Danaus plexippus monarch 2025-08-03 view observation
Rhodiola rosea roseroot 2025-07-31 view observation
Rhodiola rosea roseroot 2025-07-31 view observation
Cornus rugosa round-leaved dogwood 2025-07-29 view observation
Cuscuta gronovii scaldweed 2025-08-01 view observation
Lysimachia maritima sea milkwort 2025-07-31 view observation
Dasiphora fruticosa shrubby cinquefoil 2025-08-03 view observation
Platanthera clavellata small green wood orchid 2025-08-01 view observation
Carex wiegandii wiegand’s sedge 2025-07-29 view observation
Bartonia virginica yellow screwstem 2025-07-31 view observation

New Park Species

A something
© Kyle Lima

There were no new species to the park reported this week.

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